Square's announced a new credit card reader is significantly smaller. The redesign was headed by former Apple employee who worked on the new slim Lighting connector. An in-depth article at Wired details the redesign not only for size, but user experience. Seems a lot of care when into making its function "satisfying" to use.

Vanhemert for Wired:

The Square Reader has one job: swiping credit cards. Any new version of the device, then, had to improve on that single, simple function. We might take a card swipe for granted, but getting every detail right takes extreme care. You have to make the swipe feel satisfying; you have to make it ready accurately enough that it works the first, every time. Those two factors help convey something in the moment about Square itself: That the company is trust worthy, rock solid, and easy.